Metal bars



6 Sheets-Sheet 1.

(NorModeL) H. A. SGHNEEKLOTH. MACHINE FOR BBNDING METAL BARS. No.468,582. Patented Feb. 9,1892.

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6 Sheets-Sheet 2. H. A. SOHNEEKLOTH. MAGHINE FOR BENDING METAL BARS.

Patented-Feb. 9, 1892.

(No Model.)

6 Sheets-Sheet 3;

(No Model.)-

H. A. SGHNEEKLOTH. MAGHINE TOR BENDING METAL BARS.

No. 468,582. Patented Feb. 9, 1892.

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(No Model.) 6 sheets sheet 4.

' H. A. SCHNEEKLOTH,

MACHINE FOR BENDING METAL BARS. No. 468,582. Patented Feb. 9', 1892.

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(No Model.)

6 SheetsSheet 5. H. A. SOHNEEKLOTH.

MACHINE FOR BBNDING METAL BARS.

PatentedFeb. 9, 1892.

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H. A. SCHNEEKLOT MAGHINE FOR BENDING META RS.

No. 468,582. Patented Feb. 9, 1892.

UNITED STATES PATENT OFFICE.

HANS A. SOHNEEKLOTH, OF NElV YORK, N. Y'.

' MACHINE FOR BENDING METAL BARS.

SPECIFICATION forming part of Letters Patent No. 468,582, dated February9, 1892. Application filed September 12,1891. Serial No. 405,515. Nomodel.)

To aZZ whom it may concern.-

Be it known that I, HANS A. SCHNEEKLOTH, a citizen of the United States,residing at New York city, in the county of New York and State of NewYork, have invented certain new and useful Improvements in Machines forBending Metal Bars, of which the followin g is a specification.

This invention has reference to an improved machine for bending metalbars or sheet-iron of all kinds at any suitable angle, as required forthe special purpose for which the bars are intended in the arts, thebending operation being accomplished ina quick, uniform, and effectivemanner by a powerdriven machine in which the jaws by which the bendingoperation is accomplished are readily adjusted, so as to bend the barsat right angles or at any other suitable angle, as required.

The invention consists of a machine for bending metal bars, whichcomprises a stationary holding-jaw, a spring-actuated jaw arranged abovethe same, means for locking and releasing said spring-actuated jaw, amovable bending jaw and a toggle-joint connected to said bending-jaw,and a rotary shaft by means of which the bending of the bar isaccomplished in connection with the holding-j aws, as will be fullydescribed hereinafter, and finally pointed out in the claims.

In the accompanying drawings, Figure 1 represents a side elevation of myimproved machine for bending metal bars. Figs. 2 and 3 are verticallongitudinal sections of the machine, showing the operative parts of thesame respectively in position before and after the bending operation isaccomplished.

Fig. 4; is a frontelevation of the machine parts being broken away. Fig.5 is a plan view of the same, also with parts broken away. Figs. 6 and 7are detail sectional views of dilferent shapes of holding-jaws, so as tobend the bars at angles of different degrees; and Fig. 8 is a verticaltransverse section showing the mechanism by which the upper bar-holdingjaw is raised, so as to permit the introducing and removing of the barpreparatory to and after the bending opera tion.

Similar letters of reference indicate correspondin g parts.

Referring to the drawings, A A represent two uprightsupporting-standards, which are connected by a number of transversestaybolts, by which the required strength and rigidity are imparted tothe standards A A. Between the upper parts of the standards A A arearranged two holding-jaws B and B, the lower jaw 13 being supportedadjustably between sector-shaped ribs 1) b of the standards A A, saidjaws being preferably made of hardened cast-iron or ot-hersuitablematerial. The lower jaw B is provided at its ends with bolts N, thatpass through arc-shaped slots 1) of the standards A A, to the threadedends of which are applied nuts I)", by means of which and interposedwashers the lower holding-jaw B can be readily adjusted and locked inany suitable position on the sectorshaped ribs 1) 1), according to theangle to which the metal bars are to be bent. After the lowerholding-jaw B is once adjusted in its proper position on thesector-shaped supporting-ribs b b it remains stationary and serves, byits upper surface, as a support for the bar that is to be bent.

At the ends of the upper jaw 13 blocks are arranged, withthe lower partsof which the ends of the jaw 3 are connected by pieces Z2, said blocksbeing located in recesses A of the standards A, in which recesses theycan move up and down. Vertical rods 13 are con neoted with said blocksand pass through the upper part of the standards A A, said rods beingthreaded at their upper ends and provided with nuts and washers, betweenwhich and bosses at the top parts of the standards A A are interposedhelical springs cl, which are of sufficient strength to produce thelifting of the upper jaw B whenever the same is released from amechanism by which the same is rigidly held in its lowermost lockedposition. The upper holding-jaw B is made of oblong shape, its lowerfront edge being either made in the form of a right angle, as shown inFigs. 2 and 3, or in the form of an obtuse angle, as shown in Fig. 6, orin the form of an oblique angle, as shown in Fig. 7, accordingly as thebars are to be bent at right angles, or at an obtuse angle, or at anoblique angle.

At the rear part of the upper holding-jaw B are arranged recessed Ways Bin which are guided two retaining sliding bolts B standards A A, wherebythey hold the jaw B in place between the jaws and prevent a movement ofsaid jaws transversely to its longitudinal axis. After the sliding boltsB have been placed into this position they are retained in place bymeans of locking-bolts e, which are arranged in recesses of thestandards at right angles to the sliding bolts, as shown in Fig. 5,-anumber of recessed washers 6 being interposed between the sliding boltsand the rear parts of the recesses, so that any lost motion of the upperholdingjaw B is compensated and the same held by the interposed washersand the locking-bolts e and nuts 6, applied to the threaded outer endsof the latter, rigidly in position. The interposed washers serve forsetting the upper holding-jaw B in its proper relative position towardthe lower jaw and serve, also,to arrange the position of the jaw B fordiiferent thicknesses of bars which are to be bent in the machine. Theupper jaw B is provided with a top plate B, which is slightly beveledtoward the upper front edge of the jaw, so that it. serves, inconnection with projections B that are cast integral with the standardsA A, and which projections are beveled at their lower edge, for guidingwedge-shaped keys 0, which are pivoted to angle-levers O, that arepivoted to'the standards A A at their upper ends and connected attheirlower ends by a transverse handlebar 0 by means of which thewedge-shaped keys 0 are either pushed inward along the inclined topplate B and projections B as shown in Figs. 2 and 3, or withdrawn fromthe same, so as to release the upper holdingjaw B, as shown in Fig. 8.

For operating the wedge-keys C the leverframe 0 C is placed either inits lowermost position,so as to rest on one of the transverse stay-boltsof the standards A A, as shown in Fig. 2, or lifted into its uppermostposition, as shown in Fig.8. The wedge-keys (J are connected by spiralsprings f with bent arms f, that are attached to the upper parts of thestandards A A, which springs serve for the purpose of retainingthewedge-keys O in contact with the lower inclined faces of theprojections B so as to permit the-reliable entering'of thewedge-keysover the top plate of thejaw B or the withdrawal of the same infollowing the motion of the operating-lever frame 0, C Vhen the wedge-keys are moved inwardly, they press the upper holding-jaw B against thetension of its springs d in downward direction, while when thewedge-keys are withdrawn the springs lift the jaw B sufficiently topermit the introduction of the bar to be bent between the lowerstationary jaw B and the upper jaw B. As soon as the bar is introducedthe wedge keys are forced in, so that the upper jaw B is lowered andpresses the end of the bar tightly against the face of the stationaryjaw B, in which position the bar is ready for the bending operation.This is accomplished by means of a bending-jaw D, which extendstransversely between two links D, that are pivoted at their upper endsto bearings of the standards A A and at their lower ends to atoggle-lever D that is pivoted at its lower end to a crank-shaft D theends of which are supported in bearings at the lower parts of thestandards A A, the links D and the lever D forming a toggle-lever thatis actuated by the rotating crank-shaft D3. Rotary motion is imparted tothe crank-shaft D by means of a gear-wheel g, that is keyed .to theouter end of the same, which gear-wheel receives motion from a pinion gon a driving shaft S, that is supported in bearings of the standards AA, and to which motion is transmitted by a suitable belt-and-pulleytrans- InlSSlOn.

To the transmitting-pulleyP the fixed member P of a clutch is applied,the loose member P of which is placed on the driving-shaft S andprovided with a grooved sleeve that is engaged by a forked arm 1.),which is attached to the outer end of a transverselyguided bar E, whichpasses through holes of the standards A A, and is providedintermediately between the same with a fixed collar h, between which andone of the standards a strong spiral spring h is introduced.

P is a cushion-spring interposed between the'loose member of the clutchand the shaft to prevent undue jolts and jars- A pin'h on the transverseslide-rod H is engaged by the fork I of a rocking shaft I on one'standard A and provided at the front and rear end of the machine withatreadle I, as shown in Fig. 1, so that the starting or stopping ofthemachine can be accomplished from the front or rear part of the machine,according to the nature of the bending operations that are performed,and according as the bars have to be introduced from the front or rearend of the machine. As soon as treadle I is lowered by the foot of theoperator the transverse slide-rod E is pushed lengthwise by the fork- 1against the tension of the spring h so that the movable member of theclutch ismoved into engagement with the fixed member of the clutch onthe driving-pulley P, whereby rotary motion is transmitted by thedrivingshaft S to the crank-shaft D and thereby by the action of thetoggle-levers the bendingjaw moved from its lowermost position on alevel with the stationary jaw B into a posi tion in front of the upperjaw B, as shown, respectively, in Figs. 2 and 3. The lower front edge ofthe upper jaw B forms the edge on which the bending operation isperformed and against which the bending-jaw has to press eeassz the barwhen the bending operation is completed. WVhen the bending-jaw hasarrived in its uppermost position in front of the upper jaw 13, themotion of the crank-shaft is completed and thereby the bending-jawreturned into its normal posit-ion, ready for the next bendingoperation. For this purpose, however, it is necessary to release the barwhich has just been bent by the action of the holding and bending jaws,which is accomplished by raising the lever-frame O (3 into the positionshown in Fig. 8, so that the wedgekeys are withdrawn, which permits thelifting of the upper holdingjaw B by the action of itssupporting-springs, so that the end of the bar is released,and therebythe latter can be removed freely from the holding-jaws. lhe next bar isthen inserted between the holding-jaws B B and the wedge-keys pushedforward by the. action of their lever-frame into backward position, soas to lower the upper holding-j aw and clamp the bar firmly between thestationary jaw and the upper jaw. The treadle is then actuated and themotion of the bending-j aw accomplished by the togglelevers, which areoperated by the driving mechanism described. After each full rotation ofthe crank-shaft D the treadles I are released and thereby the members ofthe clutch disconnected, so that the pulley P turns loosely on thedriving-shaft S, whereby the motion of the transmitting mechanism isstopped.

By the joint action of the holding-jaws B B and the bending-jawsoperated by the togglelever of the driving mechanism described bars ofconsiderable size can be bent to any suitable angle in a quick andaccurate manner, so that the machine forms a valuable implement formetal-workers and a useful auxiliary for bending metallic bars of allkinds.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a machine for bending metal bars, thecombination, with a frame, of a lower holding-j aw mounted adjustably insaid frame, an upper holding-jaw mounted vertically movable in saidframe, means for locking the upper jaw in place, a bending-jaw heldbetween pivoted links, and means for turning said links on their pivots,substantially as set forth.

2. In a machine forbending metal bars, the combination, with twostandards having sector-shaped ribs, of a lower holding-j aw mounted adjustably on said ribs, a vertically-movable upper holding-jaw, abending-jaw held between pivoted links, and means for turning said linkson their pivots, substantially as set forth.

3. In a machine for bending metal bars, the combination, with twostandards, of a lower adjustable holding-jaw between the standards, avertically-m ovable upper holding-j aw, slide-bolts in said jaw forengaging parts of the standards and preventing movement of theupperholding-j aw transversely to its longitudinal axis, and aswingingbending-jaw and means for bending the same, substantially as set forth.

4. I11 a machine for bending metal bars, the combination, with anadjustable lower holding-jaw, of a vertically-movable upper holding-jaw,a spring for drawing the upper holding jaw upward, wedge-keys forforcing it downward, and a swinging bending-jaw, substantially as setforth.

5. In a machine for bending metal bars, the combination, with twostandards, of an adj ustable lower holding-jaw, a vertically-movableupper holding-jaw, beveled top plates on the same, wedge-keys forpressing the upper holding-j aw downward, beveled projections on theframe, again st which said wedge-keys can rest,

- and springs for drawing the upper holdingjaw upward, substantially asset forth.

6. In a machine for bending metal bars, the combination of an adjustablelower holdingjaw, a vertically-movable upper jaw, springs for drawingthe upper jaw upward, wedgekeys for pressing the upper jaw downward, anda swinging frame to which'said wedgekeys are fixed, substantially as setforth.

7. In a machine for bending metal bars, the combination, with twostandards, of a lower holding-jaw, a vertically-movable upperholding-jaw, springs for drawing the upper jaw upward, wedge-keys forpressing the upper holding-jaw downward, a swinging frame to which saidwedge-keysare pivoted,and springs for drawing said wedge-keys upward,substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

HANS A. sonNEEKLo'rI I.

Witnesses:

OSCAR F. GUNZ, A. M. BAKER.

